Gate-tunable negative longitudinal magnetoresistance in the predicted type-II Weyl semimetal WTe₂.

ABSTRACT: The progress in exploiting new electronic materials has been a major driving force in solid-state physics. As a new state of matter, a Weyl semimetal (WSM), in particular a type-II WSM, hosts Weyl fermions as emergent quasiparticles and may harbour novel electrical transport properties. Nevertheless, such a type-II WSM material has not been experimentally observed. In this work, by performing systematic magneto-transport studies on thin films of a predicted material candidate WTe₂, we observe notable negative longitudinal magnetoresistance, which can be attributed to the chiral anomaly in WSM. This phenomenon also exhibits strong planar orientation dependence with the absence along the tungsten chains, consistent with the distinctive feature of a type-II WSM. By applying a gate

SUBMITTER: Wang Y 

PROVIDER: S-EPMC5062597 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature